<template>
  <div id="home">
    <nav-bar class="home-nav">
      <div slot="center">购物街</div>
    </nav-bar>
    <scroll class="content" ref="scroll" :probe-type="3" @scroll="contentScroll" :pull-up-load="true" @pullingUp="loadMore">
      <home-swiper :banners="banners" />
      <home-recommend :recommends="recommends" />
      <feature-view />
      <tab-control class="tab-control" :titles="['流行','新款','精选']" @tabClick="tabClick"></tab-control>
      <goods-list :goods="showGoods" />
    </scroll>
    <back-top @click.native="backClick" v-show="isShowBackTop"/>
  </div>
</template>

<script>
import HomeSwiper from "./childComps/HomeSwiper";
import HomeRecommend from "./childComps/HomeRecommend";
import FeatureView from "./childComps/FeatureView";

import NavBar from "components/common/navbar/NavBar";
import TabControl from "components/content/tabControl/TabControl";
import GoodsList from "components/content/goods/GoodsList";
import Scroll from "components/common/scroll/Scroll";
import BackTop from 'components/content/backTop/BackTop'

import { getHomeMultidata, getHomeGoods } from "network/home";

import BScroll from "better-scroll";

export default {
  name: "Home",
  components: {
    HomeSwiper,
    HomeRecommend,
    FeatureView,
    NavBar,
    TabControl,
    GoodsList,
    Scroll,
    BackTop
  },
  data() {
    return {
      banners: [],
      recommends: [],
      goods: {
        pop: { page: 0, list: [] },
        new: { page: 0, list: [] },
        sell: { page: 0, list: [] }
      },
      currentType: "pop",
      isShowBackTop:false
    }
  },
  computed: {
    showGoods() {
      return this.goods[this.currentType].list;
    }
  },
  created() {
    // 1.请求多个数据
    this.getHomeMultidata();
    // 2.请求商品数据
    this.getHomeGoods("pop");
    this.getHomeGoods("new");
    this.getHomeGoods("sell");
  },
  methods: {
    // 事件监听相关的方法
    tabClick(index) {
      switch (index) {
        case 0:
          this.currentType = "pop";
          break;
        case 1:
          this.currentType = "new";
          break;
        case 2:
          this.currentType = "sell";
          break;
      }
    },
    backClick(){
      this.$refs.scroll.scrollTo(0,0)
    },
    contentScroll(position){
      this.isShowBackTop = -position.y>1000
    },
    loadMore(){
      this.getHomeGoods(this.currentType)
      this.$refs.scroll.scroll.refresh()
    },
    // 网络请求相关
    getHomeMultidata() {
      getHomeMultidata().then(res => {
        this.banners = res.data.banner.list
        this.recommends = res.data.recommend.list
      });
    },
    getHomeGoods(type) {
      const page = this.goods[type].page + 1
      getHomeGoods(type, page).then(res => {
        this.goods[type].list.push(...res.data.list)
        this.goods[type].page += 1
        this.$refs.scroll.finishPullUp()
      })
    }
  }
};
</script>

<style scoped>
#home {
  padding-top: 44px;
  height: 100vh;
  position: relative;
}
.home-nav {
  background-color: var(--color-tint);
  color: #fff;
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  z-index: 9;
}
.content {
  overflow: hidden;
  position: absolute;
  top: 44px;
  bottom: 49px;
  left: 0;
  right: 0;
}
</style>